body {
  background-color: #f4f4f4;
}

.color-box {
  width: 200px;
  height: 200px;
  background-color: red;
}

.color1 {
  background-color: #666;
}

.color2 {
  background-color: rgb(150, 200, 150);
}

.color3 {
  background-color: green;
}

.color4 {
  background-color: hsl(150, 30%, 80%);
}

.color5 {
  background-color: yellow;
}